TWI461966B - Coordinate locating method, coordinate locating device, and display apparatus comprising the coordinate locating device - Google Patents

Description

Coordinate positioning method, coordinate positioning device, and display device including the coordinate positioning device

The present invention generally relates to a coordinate positioning device and, more particularly, to a coordinate positioning device for a display device.

Various coordinate positioning devices for locating the coordinates of an object are well known. Some coordinate positioning devices detect coordinates from objects pointing to the device, such as a pen, fingertip, or dedicated device. Therefore, the user can use the pointing device to input information.

Common techniques employed in conventional coordinate positioning devices for locating object coordinates include mechanical buttons, intersecting beams, surface acoustic waves, capacitive sensing, and resistive materials. Among these technologies, the technique of using intersecting beams is cost-competitive because it is not limited by the size of the display panel.

For example, U.S. Patent No. 7,414,617 to Yasuji Ogawa, et al., discloses a coordinate positioning device for generating coordinates. The device includes a pair of cameras located at the upper left and upper right corners of the display.

In another example, US Patent No. 7,342,574 to Susumu Fujioka discloses a method for inputting information containing coordinate data, the method comprising providing at least two cameras at respective corners of the display.

In another example, U.S. Patent No. 5,525,764 to the disclosure of U.S. Pat.

However, these conventional coordinate positioning devices are implemented to have at least two light sources and two detectors (or two cameras). In addition, since each light source and corresponding detector are disposed at the same location (eg, a corner of the display panel), each set of light sources and detectors can only form a shadow of the object. Therefore, conventional coordinate positioning devices are not limited to determining the coordinates or posture of a single object, and thus the application is limited.

In view of the above, there is provided a coordinate positioning device that requires lower manufacturing costs and that can position the coordinates of a single or multiple objects. In addition, a coordinate positioning method applicable to the coordinate positioning device is also provided herein.

In one aspect, a coordinate positioning apparatus is provided for a display device comprising: a light source configured to emit light, wherein the light source comprises a light emitting device; at least one reflector configured to reflect Light from the light source; and a detector configured to detect light reflected by the at least one reflector, wherein the light source and the detector are disposed on a same edge of the coordinate positioning device Location.

In addition, a display device is also provided that includes the coordinate positioning device and the display panel, wherein the coordinate positioning device is disposed about the display panel.

In another aspect, a coordinate positioning method is provided for a coordinate positioning device having a light source, at least one reflector, and a detector, the method comprising: obtaining a first between the light source and the first shadow a line, the first shadow is projected by an object entering the coordinate positioning device and appears on the at least one reflector; and a second line is obtained between the detector and the second shadow, the second shadow is An object is projected and appears on the at least one reflector; and a coordinate of the object is positioned at an intersection of the first line and the second line.

In another aspect, a coordinate positioning method is provided for a coordinate positioning device having a first light source, a second light source, at least one reflector, and a detector, the method comprising: simultaneously opening the first The light source and the second light source are configured to detect a plurality of shadows projected by the object entering the coordinate positioning device and appearing on the at least one reflector; obtaining at least two lines of the plurality of lines, wherein the plurality of lines Each of the lines is located between one of the first light source, the second light source, and the detector and one of the detected shadows; and determining that the object is at least two of the coordinates One of the intersections of the lines.

In still another aspect, a coordinate positioning method is provided for a coordinate positioning device having a first light source, a second light source, at least one reflector, and a detector, the method comprising: simultaneously opening the first And a second light source to detect a plurality of shadows projected by the at least two objects entering the coordinate positioning device and appearing on the at least one reflector; according to one of the plurality of shadows Shading to obtain a first group line; obtaining a second group line according to the second group shadow of the plurality of shadows different from the first group shadow; according to the first group line and the second group Aligning a possible coordinate of a group; obtaining a third group line according to the second group line and possible coordinates of the group; and determining coordinates of the at least two objects by the third group line .

In another aspect, a coordinate positioning method is provided for a coordinate positioning device having a first light source, a second light source, at least one reflector, and a detector, the method comprising: turning on by rotation The first light source and the second light source respectively detect a first group shadow and a second group shadow, wherein the first group shadow and the second group shadow are performed by one or more objects entering the coordinate positioning device Projecting and appearing on the at least one reflector; obtaining a first group line according to the first group shadow; obtaining a second group line according to the second group shadow; according to the first group shadow and The number of individual shadows of the two group shadows and the first group line and the second group line determine one or more coordinates of the one or more objects.

These and other features, aspects, and embodiments are described below in the section entitled "Implementation."

1A is an embodiment showing a schematic diagram of a coordinate positioning device 100; and FIG. 1B is an embodiment showing a structure of the display device 110. The display device 110 uses the coordinate positioning device 100 of FIG. 1A. As shown in FIG. 1A, coordinate positioning device 100 can include a light source 120 configured to emit light, a reflector 130 configured to reflect light from light source 120, and a detector 140 configured to detect The light reflected by the reflector 130 is measured. The light source 120 and the detector 140 can be disposed at different positions on the same edge of the coordinate positioning device 100 (譬, the top edge or the right edge of the screen as shown in FIG. 1A, etc.). In the preferred case, the distance between the light source 120 and the detector 140 is greater than 2 cm in the direction of the edge.

Light source 120 is preferably an invisible light source, and more preferably an infrared (IR) light source. In particular, light source 120 can include a light emitting device configured to emit light, which can be, for example, an LED, an IR LED, or a laser source. In another embodiment, light source 120 can further include a light shaping device configured to shape the light emitted by the self-illuminating device. For example, the light shaping device can include one or more scanning mirrors, one or more lenses, or one or more diffractive optical elements configured to convert light emitted from the light emitting device into divergent light. In particular, in a particular embodiment in which the illumination device is implemented as a laser source, the light shaping device may preferably comprise a Powell lens or a diffractive optical element that converts light emitted from the laser source. Become a astigmatism.

Figures 1C and 1D are a specific embodiment illustrating an illustration of the shaping effect of a light shaping device. In this embodiment, the light-emitting device of the light source 120 of FIG. 1A is implemented as a light-emitting diode (LED) 181 for the purpose of illustration and not limitation of the present invention. Referring to FIG. 1C, the light shaping device can include one or more first type of lenses 182 disposed adjacent to the LEDs 181 that are configured to expand the scanning angle of the LEDs 181 by diverging light from the LEDs 181, More areas on the illumination plane (eg, xy plane). Referring to FIG. 1D, an additional or additional option is that the light shaping device can include one or more second types of lenses 183 disposed adjacent to the LEDs 180 that are configured to concentrate light from the LEDs 181 to increase the plane The brightness of the light on (for example, the yz plane).

Reflector 130 is preferably implemented as a diffuse reflector that diffuses light from the source. Moreover, more reflectors can be implemented in other embodiments.

On the other hand, for example, the detector 140 can include an image sensor, a camera, or a photodiode.

When an object (eg, a finger, a pen, etc.) enters the coordinate positioning device 100, it blocks light from the light source 120 and light reflected by the reflector 130, causing shadows to appear on the reflector 130. Then, the detector 140 can detect the shadow of the object and can locate the coordinates of the object according to the shadow detected by the detector 140.

By locating the light source 120 and the detector 140 at different positions, even if the total number of light sources and detectors of the coordinate positioning device 100 is smaller than that of the conventional technology using at least two light sources and at least two detectors, the light source and the detector The total number, which is still able to locate the coordinates of the object entering it, is explained in detail in the related embodiments of Figures 2 and 3A to 3C.

Additionally, coordinate positioning device 100 can further include an interface connectable to display device 110 (e.g., the display device shown in FIG. 1B).

Referring to FIG. 1B, the display device 110 can include a display panel 170 on which an object to be positioned can move, and a coordinate positioning device 100 disposed around the display panel 170 to detect coordinates of an object. When an object moves over or over display panel 170 and thus enters coordinate positioning device 100, it can block light from source 120 and light reflected by reflector 130, causing shadows to appear on reflector 130. Then, the detector 140 of the coordinate device 100 can detect the shadow of the object. The coordinates of the object can be located based on the detected shadow. According to the above embodiment, the display device 110 can be used as a touch display device.

2 is an embodiment of a flow chart showing the steps of defining the coordinates of an object entering the coordinate positioning device 100 of FIG. 1A. Figures 3A through 3C are a particular embodiment of an illustrative illustration for explaining how the steps of Figure 2 can be performed.

Referring first to FIG. 3A, when an object entering coordinate positioning device 100 is located at point "A" (such as above or above display panel 170 of FIG. 1B), a first shadow P1 of the object may extend along from source 120 and It appears on the reflector 130 by the direction of the first line L1 of the coordinate "A" because the light from the light source 120 and in the direction of the first line L1 is blocked by the object at the coordinate "A". Next, referring to FIG. 3B, the second shadow P2 may appear on the reflector 130 along the direction extending from the detector 140 through the second line L2 of the coordinate "A" because it is reflected by the reflector 130 and along Light in the direction of the second line L2 is blocked by an object at the coordinate "A". Therefore, the coordinate "A" of the object is the intersection of the first line and the second lines L1 and L2, as shown in Fig. 3C.

2 and 3A to 3C, the flow for locating the coordinates of the object may begin with step 210, wherein a first line L1 is obtained, which is located at the light source 120 and the first shadow projected by the object and appearing on the reflector 130. Between P1. Next, the flow proceeds to step 220 where a second line L2 is obtained which is located between the detector 140 and a second shadow P2 formed by the object and appearing on the reflector 130. Finally, step 230 can be performed to position the coordinates of the object at the intersection "A" of the first line and the second lines L1 and L2.

One unique feature of the coordinate positioning device 100 is that the light source 120 and the detector 140 are disposed at different locations rather than at the same location as in the prior art. As shown in FIG. 2 and FIGS. 3A to 3C, since the light source 120 and the detector 140 are disposed at different positions, the two shadows P1 and P2 of the object can be formed instead of one shadow. The coordinate positioning device 100 is capable of locating the coordinates of the object based on the two shadows P1 and P2.

4A is another embodiment of a structural schematic diagram of the coordinate positioning device 400 shown; and FIG. 4B is an embodiment showing a schematic configuration of the display device 410 employing the coordinate positioning device 400 of FIG. 4A.

The coordinate positioning device 400 of FIG. 4A differs from the coordinate positioning device 100 of FIG. 1A only in that it includes more light sources: a first light source 421 and a second light source 422. Similarly, coordinate positioning device 400 also includes a reflector 430 configured to reflect light from the first source and second sources 421 and 422, and a detector 440 configured to detect by reflector 430 Reflected light. In addition, the first and second light sources 421 and 422 and the detector 440 are disposed at different locations on the same edge of the coordinate positioning device 400 (eg, the top or right edge of FIG. 4A, etc.). In a preferred case, the distance between the first light source 421 and the detector 440 is greater than 2 cm along the edge. Similarly, the distance between the second source 422 and the detector 440 is preferably greater than 2 cm along the edge in the preferred direction.

In such an embodiment, even if the number of detectors of the coordinate positioning device 400 is less than the number of detectors in the conventional art using at least two detectors, it can appear on the reflector 430 according to one or more objects. The shadow detected by the detector 440 is then used to obtain the coordinates of one or more objects entering the coordinate positioning device 400.

Similarly, in FIG. 4B, display device 410 can include a display panel 470 on which objects to be positioned can move, and a coordinate positioning device 400 that is disposed about display panel 470. When one or more objects move over or over the display panel 470, the one or more objects can block light from the first and second light sources 421 and 422 and light reflected by the reflector 430, thereby causing shadows to appear On the reflector 130. Next, the detector 440 of the coordinate positioning device 400 can detect the shadow of the one or more objects. The coordinates of the one or more objects can thus be located based on the detected shadow.

5 is an embodiment of a flow chart showing the steps of positioning the object of the object of the coordinate positioning device 400 of FIG. 4A. Figure 6 is a specific embodiment of an illustrative illustration for explaining how the steps shown in Figure 5 can be performed.

Referring to both FIG. 5 and FIG. 6, the positioning process of FIG. 5 can be started in step 510. In this step, the first light source and the second light source 421 and 422 are simultaneously turned on, and the three shadows P1, P2, and P3 of the object are caused. It can appear on the reflector 430. Three shadows P1 through P3 can then be detected by the detector 440.

Next, in step 520, at least two of the plurality of lines may be obtained, wherein each of the plurality of lines may be obtained from one of the first light source 421, the second light source 422, and the detector 440, and Between the detected shadows P1 to P3. Specifically, the plurality of lines may include: a first line L1 between the second light source 422 and a first shadow P1 that is closest to the first light source 421; and a second line L2, which is located at the a light source 421 is disposed between the third shadow P3 and the third shadow P3 that is closest to the second light source 422; and the third line L3 is located between the detector 440 and the detected shadows P1 to P3 except for the first shadow and Between the third shadow P1 and the second shadow P2 outside the P3. In summary, the at least two lines may be lines L1 and L2, lines L2 and L3, lines L1 and L3, or lines L1 to L3.

Next, in step 530, it may be determined that the coordinates of the object are located at the intersection point "A" of the at least two lines L1 and L2, the lines L2 and L3, the lines L1 and L3, or the lines L1 to L3, as shown in FIG. .

7 is an embodiment of a flow chart showing the steps of entering at least two objects of the coordinate positioning device 400 of FIG. 4A to position their coordinates.

As shown in the figure, the flow of FIG. 5 starts with step 510. In this step, the first light source and the second light source 421 and 422 are simultaneously turned on, and can be detected by the detector 440 on the reflector 430. The shadow of the two objects.

It should be noted that in step 710, a shadow of a different number of two objects can be formed and detected. In general, six shadows can appear on the reflector 430: three shadows projected by one of the objects, and three shadows projected by the other object. However, in some cases, some of the 6 shadows may happen to overlap, so the detector 440 can detect 6, 5 or 3 shadows, as shown in Figures 8A to 8C, which are respectively An illustrative illustration showing different shaded configurations with 6, 5, and 3 shadows.

The following steps of FIG. 7 are exemplarily described for a shadow configuration having "6 shades" as shown in FIG. 8A, but can be easily applied by analogy to have "5" as shown in FIGS. 8B and 8C. Shadow configuration of "shadow" and "3 shadows".

The positioning process then proceeds to step 720 where the first group line is obtained based on the first group shadow in the detected shadow (e.g., P1 through P6 of Figure 8A). 9A, which is a particular embodiment of an illustrative illustration of how step 720 can be performed, wherein the first group of shadows includes shadows P1 that are closest to first light source 421 and closest to second light source 422, respectively. P6. In addition, the first group line may also include a line L16 between the first light source 421 and the shadow P6, and a line L21 between the second light source 422 and the shadow P1.

As shown in FIG. 9A, both objects must be located on the other side of the line L16 opposite to the side where the second light source 422 is located (for example, the left side in FIG. 7A), otherwise a difference from the shadow P6 but the shadow P6 may occur. A shadow that is closer to the second light source 422. Similarly, both objects must be located on the other side of the line L21 opposite the side where the first light source 421 is located (for example, the right side in FIG. 7A), otherwise it will appear different from the shadow P1 but closer to the first than the shadow P1. The shadow of the light source 421.

Next, the flow proceeds to step 730 where a second group line is obtained in accordance with a second group shadow that is different from the first group shadow. Referring to Figure 9B, which is a particular embodiment of an illustrative illustration of how step 730 can be performed, this second group of shading includes intermediate shadows P2 through P4 other than shadows P1 and P6. In addition, the second group line also includes lines LD2 to LD5 located between the detector 440 and the intermediate shadows P2 to P5, respectively.

Next, in step 740, a group of possible coordinates of the two objects may be obtained according to the first group line and the second group line. 9C, which is an illustrative illustration of how step 740 can be performed, wherein the possible coordinates include a first intersection "E" of the first group line L16 and L21, and a first group line L16 and L21 A plurality of second intersection points "A", "B", "C", and "D" with the second group lines LD2 to LD5, and these points are all located on the line "P1-E-P6". The first intersection point "E" and the second intersection point "A" to "D" are possible coordinates because at least one of the two objects must be located on at least one of the possible coordinates.

Next, the flow proceeds to step 750, in which the second group lines LD2 to LD5 obtained in steps 730 and 740 and the group possible coordinates "A" to "E" are obtained. The third group line.

FIG. 10 is a diagram showing a particular embodiment of a detailed flow chart of step 750 of FIG. As shown, step 750 can begin with step 1010 to determine if the first intersection point "E" of the first group line L16 and L21 is the position of one of the two objects, and this determination manner This is done by checking whether the first intersection point "E" is located on any of the second group lines LD2 to LD5. 11A and 11B are two exemplary illustrations of different shaded configurations, respectively, corresponding to negative and positive determinations. Specifically, if the determination result is affirmative (Yes), that is, the first intersection point "E" is located on one of the second group lines LD2 to LD5 (for example, LD3 shown in FIG. 11A), then the determination is made. An intersection point "E" is the location of one of the two objects, and the flow of step 740 continues to step 1020, after which the position of the other object can be determined. On the other hand, if the determination result is negative ("No"), that is, the first intersection point "E" is not located on any of the second group lines LD2 to LD5 (as shown in FIG. 11B), it can be determined that An intersection point "E" is not the location of either of the two objects, and the flow of step 740 continues to step 1030, after which the coordinates of the two objects can be determined.

In step 1020, a third group line is obtained that includes at least two lines that do not pass the first intersection point "E". 12A and 12B are diagrams showing one particular embodiment of how the steps of step 1020 can be performed. First, referring to FIG. 12A, the shadow generated by the object at the coordinate "E", that is, the shadows P1, P6, and P3 located on the line passing through the first intersection point "E" in FIG. 11A can be deleted. Next, a third group line including a line that does not pass the first intersection point "E" may be obtained, and the third group line (eg, as shown in FIG. 12B) may include a first line L15, which is located at the a light source 421 and a shadow P5 closest to the second light source 422 among the remaining shadows P2, P4 and P5, and a second line L22 located closest to the first of the second light source 422 and the remaining shadows P2, P4 and P5 Between the shadows P2 of the light source 421, and the third line LDC, which is located between the detector 440 and the intermediate shadow P4 of the remaining shadows P2, P4 and P5. Therefore, the process of locating the third group line in step 750 of FIG. 7 can be completed.

On the other hand, after determining that the first intersection point "E" is not the position of either of the two objects, the process proceeds to step 1030, where it can be preliminarily estimated that the two objects must be located on the line "P1-E-P6". This line "P1-E-P6" passes through the shadow P1, the intersection point "E" of the first group line L16 and L21, and the shadow P6. Accordingly, in step 1030, a third group line is obtained that includes a first line from one of the first source and the second source 421 and 422 through the group possible coordinates "A" to "" One of E" and extending to one of the second group of shadows P2 to P5, and obtaining a second line from the other of the first light source and the second light sources 421 and 422, through the above group The group may coordinate another coordinate from "A" to "E" and extend to another shadow in the second group of shadows P2 to P5.

FIG. 13 is a specific embodiment showing a detailed flow chart of step 1030 of FIG. As shown, step 1030 can begin at step 1030 to obtain all possible combinations from the two intersection points of the second intersection point "A" through "D". Referring to FIG. 11B, each of the possible combinations may include two points on lines L16 and L21 in the first group line, respectively. Therefore, four possible combinations are available: "A+C", "A+D", "B+C", and ""B+D".

Next, the flow of step 760 proceeds to step 1320, in which each of the possible combinations "A+C", "A+D", "B+C", and "B+D" is obtained. The two corresponding lines are obtained by connecting the first source and the second source respectively through two points in each of the possible combinations. 14A and 14B are illustrative diagrams illustrating how step 1320 can be performed in accordance with certain embodiments. Referring to Figure 14A (which illustrates the positioning procedure for possible combinations "A+C"), line L1A extends from first source 421 through second intersection point "A" and line L2C extends from second source 422 through second Intersection point "C". Referring to Figure 14B (which illustrates the positioning procedure for possible combinations "B+C"), line L1B extends from first source 421 and through second intersection point "B", while line L2C extends from second source 422 through Two intersection points "C". For the other two possible combinations "A+D" and "B+D", a similar positioning procedure can be performed, which is omitted here for the sake of brevity.

Next, the flow of step 1030 proceeds to step 1330 where each of the possible combinations is verified by checking if the two respective lines pass the two shadows in the second group shadows P2 through P5. Referring to FIG. 14A, for the lines L1A and L2C that may combine "A+C", they do not extend through the two shadows in the second group shadows P2 to P5. Conversely, for lines L1B and L2C that may combine "B+C", they extend through the two shadows P3 and P4 of the second group of shadows P2 to P5. For the other two possible combinations "A+D" and "B+D", a similar verification process can be performed, which is omitted here for the sake of brevity.

Next, the flow of step 1030 proceeds to step 1340, where it may be determined that the first line and the second line of the third group line are two of the possible combinations of the two shadows through the second group shadows P 2 to P5. line. Therefore, it can be determined that the first line is the lines L1B and L2C, so that the process of locating the third group line in step 750 of FIG. 7 can be completed.

Referring back to Figure 7, after the step 750 of locating the third group line, the flow proceeds to step 760 where the coordinates of the two objects can be located by the third group line.

Finally, the flow of Figure 7 proceeds to step 760 where the coordinates of the two objects can be determined by the third group line. Referring to FIG. 12B (wherein the third group line including the lines L22, LD4, and L15 is obtained), after determining that the first intersection point "E" is the position of one of the two objects, one of the two objects may be determined. The position of the person is the intersection point "C" of at least two of the third group lines L22, LD4, and L15. On the other hand, referring to FIG. 14B (where the third group line including the first line and the second line L2C and L1B is obtained), after determining that the first intersection point "E" is not the position of one of the two objects, It is then determined that the coordinates of at least two objects are a possible combination of two points "B" and "C" (located on the first line and the second lines L2C and L1B, respectively).

It can be easily understood that the first, second and third group lines are not limited to being obtained in the order illustrated by the exemplary embodiment of FIG. For example, in an alternate embodiment, steps 720 and 730 in FIG. 7 may be interchanged, and the reverse order may be used to obtain the first group line and the second group line.

Moreover, in the above embodiments, the possible coordinates can be located by positioning the line passing through the detector 440, and then verifying the possible coordinates by positioning the lines passing through the first light source and the second light sources 421 and 422. . However, in other embodiments, multiple possible coordinates may be located by obtaining lines through the first and second light sources 421 and 422, and then the possible coordinates may be verified by positioning the line through the detector 440. .

In addition, the flow illustrated in FIG. 7 is not limited to the configuration of 6 shades, and it can also be applied to a shadow configuration having 5 or 3 shadows. Since the number of shadows in the shadow of the second group differs depending on the shadow configuration, the flow performed for the various shadow configurations is mainly different in the number of lines in the second group. Other details can be easily understood by analogy, which are omitted here for the sake of brevity.

15 is another embodiment of a flow chart showing the steps of positioning the coordinates of at least two objects entering the coordinate positioning device 400 of FIG. 4A.

First, step 1510 may be performed to turn on the first light source 421 and the second light source 422 in turn; and after the first light source is turned on, detecting one or more objects (such as two objects) entering the coordinate positioning device 400 Projecting and appearing on the first group of shadows on the reflector 430, and after turning on the second light source, detecting that the one or more objects (such as two objects) entering the coordinate positioning device 400 are projected and appear A second group of shadows on the reflector 430. For example, the first light source 421 can be turned on first and the second light source 422 can be turned off at the same time, and then the detector 440 can detect the first group of shadows. Next, the second light source 422 can be turned on and the first light source 421 can be turned off at the same time, and then the detector 440 can detect the second group of shadows, etc.

In step 1510, five different types of shadow configurations (hereinafter referred to as "type 1" to "type 5") can be detected, the shadow configurations having the first group shadow and the second group shadow A variety of different numbers of shadows, and having a different number of common shadows for both the first group and the second group. A table below is provided to summarize the different types of shadow configurations. In this table, the number of shadows in the first group and the second group are labeled "N1" and "N2", respectively. "Type 1" is caused by a single object, and each of "Type 2" to "Type 5" is caused by two objects. "Type 2" and "Type 3" differ only in the number of common shadows.

Next, the process proceeds to steps 1520 and 1530, which may be performed simultaneously or sequentially to locate the first group line according to the first group shadow, and to locate the second group line according to the second group shadow. . In the preferred case, the first group line and the second group line may comprise lines that are initially estimated to pass the coordinates of the two objects. For example, the first group line may include a line between the first light source and a shadow of one of the first group shadows closest to the second light source, and the second group line may include the second light source and the second The second line of the second group of shadows that is closest to the second shadow of one of the first light sources. The details of the first group line and the second group line will be illustrated below for an embodiment of a particular type of shadow configuration.

Next, the flow proceeds to step 1540 for determining one or more coordinates by the first group line and the second group line depending on the type of shadow configuration. In other words, this determination can be made based on the number of shadows in each of the first group and the second group. In addition, since "Type 2" and "Type 3" differ only in the number of common shadows, if the number of shadows in each of the first group shadow and the second group shadow is 4 The determination may be further implemented based on the number of common shadows of the first group and the second group.

16 is a particular embodiment of a detailed flow diagram for steps 1520, 1530, and 1540 of FIG. 15 for a shaded configuration of type 1. In type 1, the number of each of the first group shadow and the second group shadow is two. 17A through 17C are a specific embodiment of an illustrative illustration of how the steps shown in Fig. 16 can be performed.

The flow of Figure 16 can begin with steps 1610 and 1620, which are specific examples of steps 1520 and 1530 of Figure 15, and can also be performed sequentially or simultaneously.

First, referring to step 1610 and FIG. 17A, a first group line may be obtained based on the first group shadows P2 and P3, and the first group line may include a line L13 located at the first light source 421 and the first group shadow Between P2 and P3 is closest to the shadow P3 of the second light source 422. In addition, the first group line may also include a line LD2 between the detector 440 and the shadow P2 of the first group shadows P2 and P3 that is closest to the first light source 421.

Turning to step 1620 and FIG. 17B of FIG. 16, a second group line may be obtained based on the second group shadows P1 and P2, the second group line including a line L21 located at the second source 422 and the second group shadow Between P1 and P2 is closest to the shadow P1 of the first light source 421. In addition, the second group line may also include a line LD2 between the detector 440 and the shadow P2 of the second group shadows P1 and P2 that is closest to the second light source 422.

Flow then proceeds to step 1630 (which is a particular example of step 1540 of Figure 15). Referring to step 1620 and FIG. 17C of FIG. 16, it may be determined that the coordinates of the object are located at intersection point "A" of at least two of the first group line and the second group line.

18 is a particular embodiment of a detailed flow diagram for steps 1520, 1530, and 1540 of FIG. 15 for a shaded configuration of type 2. In type 2, the number of shadows of each of the first group shadow and the second group shadow is 4, and the number of common shadows of the first group and the second group is 2. 19A through 19F are a particular embodiment of an illustrative illustration of how the steps shown in Fig. 18 can be performed.

The flow of FIG. 18 can begin with steps 1810 and 1820. Steps 1810 and 1820 are specific examples of steps 1520 and 1530 of FIG. 15, and can also be performed sequentially or simultaneously. Steps 1810 and 1820 are similar to steps 1610 and 1620 in FIG.

Referring to step 1810 and FIG. 19A of FIG. 18, a first group line may be obtained based on the first group shadows P3 to P6, the first group line comprising: a first line L16 located at the first light source 421 and the first Between the first shadow P6 of the group shadows P3 to P6 that is closest to the second light source 422, and the third line LD3, which is located closest to the first light source 421 among the detector 440 and the first group shadows P3 to P6. The shadow between P3.

Turning to step 1820 and FIG. 19B of FIG. 18, a second group line may be obtained based on the second group shadows P1 to P4, the second group line comprising: a second line L21 located at the second light source 422 and the second a second shadow P1 of the group shadows P1 to P4 that is closest to the first light source 421; and a fourth line LD4 that is located closest to the second light source among the detector 440 and the second group shadows P1 to P4 422 shadow between P4.

Next, steps 1830, 1840, and 1850 can be performed in sequence, all of which are specific examples of step 1540 of FIG. First, referring to step 1830 and FIGS. 19C and 19D, it is determined whether the first intersection point "E" of the first line L16 of the first group line and the second line L21 of the second group line is the position of one of the objects. For example, by checking whether the first intersection point "E" is located in the third line of the first group (LD3 in FIG. 19C and LD2 in FIG. 19D) or the fourth line of the second group line (FIG. 19C) And any of LD4) in both FIG. 19D is determined. Next, referring to step 1840 and FIG. 19E of FIG. 18, if the determination result of step 1830 is affirmative ("Yes") (as shown in FIG. 19C), it means that the first intersection point "E" is one of the objects. The position of the other of the objects can be determined to be the second intersection point "C" of at least two lines that do not pass the first intersection point "E" (eg, lines L23, L15, and LD4 in Figure 19E). At the office. According to an example, the at least two lines may be obtained in steps similar to step 1020 of FIG. 10 to locate the third group line (exemplarily shown as lines L15, L22, and LD4 in FIG. 12B), where The details are omitted for the sake of brevity.

Next, referring to step 1850 and FIG. 19F of FIG. 18, if the determination result of step 1830 is negative ("NO") (as shown in FIG. 19D), it means that the first intersection point "E" is not one of the objects. The coordinates of the object can be determined that the coordinates of the object are located at the intersection point "B" of the third intersection point "A" to "D" of the first group line and the second group line L16, L21, LD3 and LD4. And "C", wherein the intersection points "B" and "C" are respectively located between the first intersection point "E" and the second shadow P1 and between the first intersection point "E" and the first shadow P6.

Compared with the embodiments of FIGS. 5 and 7 (in FIGS. 5 and 7 , the first light source and the second light source 421 and 422 are simultaneously turned on, and the line passing through the coordinates of one or more objects can be preliminarily estimated to include only the first Group lines L16 and L21), in the embodiment of FIG. 12, may initially locate more lines of coordinates passing through the object (ie, the first group line and the second group line L16, L21, LD3, and LD4) ). Therefore, steps 730 and 740 for locating a group of possible coordinates in FIG. 7 may be omitted, and steps 1310 to 1340 for verifying the group possible coordinates by locating a possible combination of the two coordinates in FIG. 13 may be omitted. .

It should be noted from FIGS. 19A and 19B that since the common shadows P3 and P4 exist in both the first group shadows P3 to P6 and the second group shadows P1 to P4, the common shadows P3 and P4 can be additionally recognized. The lines L16, L21, LD3, and LD4 of the first group and the second group are obtained in an order different from steps 1810 and 1820 in FIG.

20A through 20C are specific embodiments of an illustrative illustration of how an executable process can be performed. Referring first to FIG. 20A, a first group line may be obtained based on the first group shadows P3 to P6, which only includes the first line L16. Referring to FIG. 20B, a second group line may be obtained based on the second group shadows P1 to P4, which only includes the second line L21. Next, referring to FIG. 20C, a step may be further performed to locate the third line and the fourth line LD3 by additionally recognizing the first group shadows P3 to P6 and the second group shadows and the common shadows P3 and P4 of P1 to P4. And LD4. The subsequent steps are similar to those described for the embodiment of Figure 18, which are omitted here for the sake of brevity.

21 is a particular embodiment of a detailed flow diagram for steps 1520, 1530, and 1540 of FIG. 15 for a "type 3" shaded configuration. In type 3, the number of shadows in the first group shadow and the second group shadow is 4, and the number of common shadows of the first group and the second group is 3. 22A through 22C are a specific embodiment for explaining an exemplary illustration of how the steps shown in Fig. 21 can be performed.

The flow of FIG. 21 can begin with steps 2110 and 2120, which is a specific example of steps 1520 and 1530 of FIG. 15, and can also be performed sequentially or simultaneously. Steps 2110 and 2120 are similar to steps 1610 and 1620 in FIG.

Referring to step 2110 and FIG. 22A of FIG. 21, a first group line may be obtained based on the first group shadows P2 to P5, including: a first line L15 located at the first light source 421 and the first group shadow P2 to Among the P5, the first shadow P5 is closest to the second light source 422; and the third line LD2 is located between the detector 440 and the shadow P2 of the first group shadows P2 to P5 which is closest to the first light source 421. .

Turning to step 2120 and FIG. 22B of FIG. 21, a second group line may be obtained based on the second group shadows P1 to P4, including: a second line L21 passing through the second light source 422 and the second group shadow P1 to The second shadow P1 that is closest to the first light source 421 among P4; and the fourth line LD4 pass through the shadow PF of the detector 440 and the second group shadows P1 to P4 that are closest to the second light source 422.

Next, step 2130 is performed as illustrated in FIG. 22C, which is a specific example of step 1540 of FIG. In step 1850 similar to FIG. 18 and step 2130 and FIG. 22C of FIG. 19F, it can be determined that the coordinates of the object are at the intersection point "A" of the first group line and the second group line L15, L21, LD2, and LD4 to The two intersection points "B" and "C" in "D", where the intersection points "B" and "C" are respectively located between the first intersection point "E" and the second shadow P1 and at the first intersection point "E" is between the first shadow P5.

It should be noted from FIGS. 22A and 22B that since the common shadows P2, P3, and P4 exist in the first group shadows P3 to P6 and the second group shadows P1 to P4, the common shadows P2 to P4 can be additionally recognized. Different lines other than the first group lines L15 and LD2 and the second group lines L21 and LD4 are obtained. 23A through 23C are three different embodiments for explaining an exemplary illustration of an executable process.

Referring to FIG. 23A, after detecting the first group shadow and the second group shadows P3 to P6 and P1 to P4, the common shadows P2 to P4 therein can be identified. Next, lines LD2 and LD4 may be obtained between the detectors 440 and the shadows P2 and P4 of the common shadows P2 to P4 that are closest to the first and second light sources 421 and 422, respectively. Further, lines L13 and L23 may be obtained between the intermediate shadow P3 in the common shadows P2 to P4 and the first and second light sources 421 and 422, respectively. Therefore, the coordinates of the object can then be positioned at the intersection of the lines LD2, LD4, L13 and L23.

Referring to FIG. 23B, after detecting the first group shadow and the second group shadows P3 to P6 and P1 to P4, lines L15 and L21 are obtained, which are respectively located in the first light source 421 and the first group. Between the shadows P5 adjacent to the second light source 422 and between the second light source 422 and the shadow P1 closest to the first light source 421. In addition, the common shadows P2 to P4 of the first group shadow and the second group shadow can be identified, and then the lines LD2 and LD4 can be obtained, which are respectively located next to the first of the detector 440 and the common shadows P2 to P4. The light source and the second light sources 421 and 422 are between the shadows P2 and P4. Thus, the coordinates of the object can then be located at the intersection of lines L15, L21, LD2 and LD4.

Referring to FIG. 23C, similar to FIG. 23B, after detecting the first group shadow and the second group shadows P3 to P6 and P1 to P4, lines L15 and L21 are obtained. In addition, the common shadows P2 to P4 of the first group shadow and the second group shadow can be recognized, and then the lines L13 and L23 can be obtained, which are respectively located in the middle shadow P3 and the first light source and the second in the common shadows P2 to P4. Between the light sources 421 and 422. Therefore, the coordinates of the object can then be positioned at the intersection of lines L15, L21, L13 and L23.

24 is a particular embodiment of a detailed flow diagram for steps 1520, 1530, and 1540 of FIG. 15 for a shaded configuration of type 4. In type 4, the number of shadows of each of the first group shadow and the second group shadow is 3. 25A through 25C are specific embodiments for explaining an exemplary illustration of how one of the steps shown in Fig. 24 can be performed.

The above flow can be initiated by steps 2410 and 2420, which can be performed simultaneously or sequentially. Referring to step 2410 and FIG. 25A of FIG. 24, a first line LD3 is obtained, which is located in the common shadow of the detector 440 and the first group shadows P3 to P5 (not shown) and the second group shadows P1 to P3. Between P3. In addition, referring to step 2420 and FIG. 25B, the second line L21 and the third line L22 are obtained, which are located between the second light source 422 and the second group shadows P1 to P3 which are not the shadows P1 and P2 of the common shadow P3. Alternatively, the second line and the third line may be obtained between the first light source 421 and the shadows P4 and P5 of the first group shadows P3 to P5 that are not the common shadow P3. Finally, referring to step 2430 and FIG. 25C, it can be determined that the coordinates of the object are located at intersections "B" and "C" of the first to third lines LD3, L21, and L22.

26 is a particular embodiment of a detailed flow diagram for steps 1520, 1530, and 1540 of FIG. 15 for a "type 5" shaded configuration. In type 5, the number of shadows in the first group shadow and the second group shadow is 4 and 3, respectively. 27A through 27G are specific embodiments for explaining an exemplary illustration of one of the steps of FIG. The flow illustrated in Figures 26 and 27A through 27G can be easily analogized to a shaded configuration of type 5 having 3 and 4 shades, respectively, in the first group and the second group. Figure 26 is similar to Figure 18 for a shaded configuration of type 2, with the main difference being steps 2610, 2620, and 2622 for initially locating the line passing through the object coordinates.

The flow of FIG. 26 can begin with steps 2610 and 2620, which are specific examples of steps 1520 and 1530 of FIG. 15, and can also be performed sequentially or simultaneously. Steps 2610 and 2620 are similar to steps 1610 and 1620 in FIG.

Referring to step 2610 and FIG. 27A of FIG. 26, a first group line may be obtained based on the first group shadows P2 to P5, the first group line including a first line L15 located at the first light source 421 and the first group Between the group of shadows P3 to P6 is closest to the first shadow P5 of the second light source 422.

Turning to step 2620 and FIG. 27B of FIG. 26, a second group line may be obtained based on the second group shadows P1 to P3, the second group line including a second line L21 located at the second light source 422 and the second group Among the group shadows P1 to P4 is the most adjacent to the second shadow P1 of the first light source 421.

Turning to step 2622 and FIG. 27C of FIG. 26, a third line LD2 and a fourth line LD3 are obtained. The third line LD2 and the fourth line LD3 are respectively located at the detector 440 and the first group shadow and the second group shadow P2. The common shadow between P5 and P1 to P3 is between P2 and P3.

Next, steps 2630, 2640, and 2650 may be performed in sequence, all of which are specific examples of step 1540 of FIG. First, referring to step 2630 and FIG. 27D and FIG. 27E, it is determined whether the first intersection point "E" of the first line L15 and the second line L21 is a coordinate of one of the objects. For example, by checking whether the first intersection point "E" is located at the third line of the first group line (LD2 in both FIG. 27D and FIG. 27E) or the fourth line of the second group line (FIG. 27D) And any of LD3) in both FIG. 27E is determined.

Next, referring to step 2640 and FIG. 27F of FIG. 26, if the determination result of step 1830 is affirmative ("Yes") (as shown in FIG. 27D), it means that the first intersection point "E" is one of the objects. The coordinates of the object can be determined that the coordinate of the other of the objects is at a second intersection point of at least two lines that do not pass the first intersection point "E" (for example, lines L22, L14, and LD3 in Fig. 27F). C". According to an example, the at least two lines may be obtained in steps similar to step 1020 of FIG. 10 to locate a third group line (which is illustratively shown as lines L15, L22, and LD4 in FIG. 12B), where The details are omitted for the sake of brevity.

Next, referring to step 2650 and FIG. 27G of FIG. 26, if the determination result of step 2630 is negative ("NO") (as shown in FIG. 27E), it means that the first intersection point "E" is not one of the objects. Position, it can be determined that the coordinates of the object are at the intersection point "B" of the third intersection point "A" to "D" of the first group line and the second group line L15, L21, LD2 and LD3 And "C", wherein the intersection points "B" and "C" are respectively located between the first intersection point "E" and the second shadow P1, and between the first intersection point "E" and the first shadow P5.

In the following description, a comparison between the coordinate positioning devices in the above embodiments and the conventional art will be described in detail to demonstrate the advantages provided by the coordinate positioning device in the above embodiment.

In a conventional coordinate positioning device, at least two light sources and two detectors are required. On the contrary, the coordinate positioning device in the above embodiment can be implemented to have only one or two light sources and only one detector, and thus the manufacturing cost is low.

In addition, conventional coordinate positioning devices can only determine the coordinates or posture of a single object. The reason is that each light source and its corresponding detector are placed at the same location (eg, at the same corner of the display panel), so only one shadow of the object can be projected. On the contrary, each of the light source and the detector in the coordinate positioning device of the embodiment of FIGS. 1A and 4A can be disposed at different positions, so that more shadows can be formed. As a result, the coordinate positioning device of the above embodiment is capable of locating the coordinates of a single or a plurality of objects, thereby having a wider application than the conventional coordinate positioning device.

100. . . Coordinate positioning device

110. . . Display device

120. . . light source

130. . . reflector

140. . . Detector

170. . . Display panel

181. . . Light-emitting diode

182. . . lens

183. . . lens

400. . . Coordinate positioning device

410. . . Display device

421. . . First light source

422. . . Second light source

430. . . reflector

440. . . Detector

470. . . Display panel

A~E. . . Intersection point

L1~L3. . . line

L13, L14, L15, L16, L21, L22, L23. . . line

L1A, L1B, L2C. . . line

LD1~LD5. . . line

P1~P6. . . shadow

1A is a block diagram showing an embodiment of a coordinate positioning device;

1B is a block diagram showing an embodiment of a display device using the coordinate positioning device of FIG. 1A;

1C and 1D are diagrams showing an embodiment of a shaping effect of a light shaping device;

2 is an embodiment of a flow chart showing the steps of positioning the coordinates of an object entering the coordinate positioning device of FIG. 1A;

3A through 3C are diagrams for explaining a specific embodiment of an example diagram of how the steps shown in Fig. 2 can be performed.

4A is another embodiment showing a schematic structural view of a coordinate positioning device;

4B is a block diagram showing an embodiment of a display device using the coordinate positioning device of FIG. 4A;

Figure 5 is a flow chart showing an embodiment of a flow chart for positioning coordinates of an object entering the coordinate positioning device of Figure 4A;

Figure 6 is a specific embodiment for explaining an example of how the steps shown in Figure 5 can be performed;

Figure 7 is a flow chart showing an embodiment of a flow chart for positioning coordinates of at least two objects entering the coordinate positioning device of Figure 4A;

8A to 8C are diagrams showing examples of different shaded configurations having 6, 5, and 3 shadows, respectively;

9A and 9B are diagrams showing a specific embodiment of an example diagram of how the steps shown in FIG. 7 can be performed;

Figure 10 is a specific embodiment showing a detailed flow chart of another step of Figure 7;

11A and 11B are two exemplary diagrams having different shade configurations corresponding to negative and positive determinations, respectively;

12A and 12B are diagrams illustrating how a particular embodiment of the diagram of step 1020 of FIG. 10 can be performed;

Figure 13 is a specific embodiment showing a detailed flow chart of the steps shown in Figure 10;

14A and 14B are diagrams showing a specific embodiment of an example diagram of how the steps shown in Fig. 13 can be performed;

Figure 15 is a flow chart showing an embodiment of a flow chart for positioning coordinates of at least two objects entering the coordinate positioning device of Figure 4A;

Figure 16 is a specific embodiment showing a detailed flow chart of the steps of Figure 15 for a first type of shadow configuration;

17A to 17C are diagrams for explaining a specific embodiment of an example diagram of how the steps shown in Fig. 16 can be performed;

Figure 18 is a specific embodiment of a detailed flow chart showing the steps shown in Figure 15 for a second type of shadow configuration;

19A to 19F are diagrams for explaining a specific embodiment of how to perform the example of the steps shown in Fig. 18;

20A through 20C are diagrams for explaining an alternative embodiment of an exemplary diagram of locating a first group line and a second group line.

Figure 21 is a specific embodiment of a detailed flow chart showing the steps shown in Figure 15 for a third type of shadow configuration;

22A to 22C are diagrams for explaining a specific embodiment of an example diagram of how the steps shown in Fig. 21 can be performed;

23A to 23C are three different specific embodiments for explaining an example of locating a first group line and a second group line;

Figure 24 is a specific embodiment of a detailed flow chart showing the steps shown in Figure 15 for a fourth type of shadow configuration;

25A through 25C are diagrams for explaining a specific embodiment of an example diagram of how the steps shown in Fig. 24 can be performed;

26 is a particular embodiment of a detailed flow diagram showing steps 1520, 1530, and 1540 of FIG. 15 for a fourth shaded configuration;

27A through 27G are diagrams for explaining a specific embodiment of an exemplary diagram of how the steps shown in Fig. 26 can be performed.

100. . . Coordinate positioning device

120. . . light source

130. . . reflector

140. . . Detector

Claims (26)

A coordinate positioning device for a display device comprising: a light source configured to emit light, wherein the light source comprises a light emitting device; at least one reflector configured to reflect light from the light source; and a detector configured to detect light reflected by the at least one reflector, wherein the light source and the detector are disposed at different positions on the same edge of the coordinate positioning device, wherein the object is A shadow appearing on the at least one reflector and detected by the detector to position a coordinate of an object entering the coordinate positioning device. The coordinate positioning device of claim 1, wherein the distance between the light source and the detector is substantially greater than 2 cm along the edge. The coordinate positioning device of claim 1, further comprising another light source disposed at a position different from a position of the light source and a position of the detector. The coordinate positioning device of claim 3, wherein the distance between the other light source and the detector is substantially greater than 2 cm along the edge. The coordinate positioning device of claim 1, wherein each of the at least one reflector is a diffuse reflector configured to diffuse light from the source in a diffuse manner. The coordinate positioning device of claim 1, further comprising an interface connectable to the display device. The coordinate positioning device of claim 1, wherein the illumination device comprises One of an infrared light emitting diode and a laser light source. The coordinate positioning device of claim 7, wherein the light source further comprises a light shaping device configured to shape light emitted from the illumination device. The coordinate positioning device of claim 8, wherein the light shaping device comprises one or more scanning mirrors, one or more lenses, or one or more diffractive optical elements. The coordinate positioning device of claim 1, wherein the detector comprises an image sensor, a camera or a photodiode. A display device comprising the coordinate positioning device of claim 1 and a display panel, wherein the coordinate positioning device is disposed around the display panel. A coordinate positioning method for a coordinate positioning device having a light source, at least one reflector and a detector, the method comprising: obtaining a first line between the light source and the first shadow, the first shadow is entered by An object of the coordinate positioning device is projected and appears on the at least one reflector; a second line is obtained between the detector and the second shadow, and the second shadow is projected by the object and appears on the at least one And on the reflector; and positioning the coordinates of the object at the intersection of the first line and the second line. A coordinate positioning method for a coordinate positioning device having a first light source, a second light source, at least one reflector, and a detector, the method comprising: Simultaneously turning on the first light source and the second light source to detect a plurality of shadows projected by the object entering the coordinate positioning device and appearing on the at least one reflector; obtaining at least two lines of the plurality of lines , wherein each of the plurality of lines is located between one of the first light source, the second light source, and the detector and one of the detected shadows; and determining a coordinate of the object At the intersection of the at least two lines. The coordinate positioning method of claim 13, wherein the plurality of lines comprise: a first line located in the first light source and the first shadow of the detected light source that is closest to the second light source a second line between the second light source and the second shadow of the detected shadow that is closest to the first light source; and a third line located at the detector and detected The shadows are not between the first shadow and the second shadow. A coordinate positioning method for a coordinate positioning device having a first light source, a second light source, at least one reflector, and a detector, the method comprising: simultaneously opening the first and second light sources to detect a plurality of shadows The plurality of shadows are projected by the at least two objects entering the coordinate positioning device and appear on the at least one reflector; the first group line is obtained according to the first group shadow of the plurality of shadows; a second group of lines in the plurality of shadows different from the second group shadow of the first group shadow; Positioning a group of possible coordinates according to the first group line and the second group line; obtaining a third group line according to the second group line and the group possible coordinates; and by using the third The group line determines the coordinates of the at least two objects. The coordinate positioning method of claim 15, wherein the first group line comprises: a line between the first light source and a shadow of one of the plurality of shadows that is closest to one of the second light sources; and A line between the second light source and the shadow of the plurality of shadows that is closest to one of the shadows of the first light source. The coordinate positioning method of claim 15, wherein each of the second group lines is located between one of the shadows of the detector and the second group shadow. The coordinate positioning method of claim 17, wherein the possible coordinate systems comprise a first intersection point of the first group line and a plurality of second intersection points of the first group line and the second group line. The coordinate positioning method of claim 18, wherein obtaining the third group line system according to the second group line and the group possible coordinates comprises: checking whether the first intersection point is located in the second group Determining whether the first intersection point is the position of one of the at least two objects; and if affirmative, obtaining the at least two lines that do not pass the first intersection point Three group lines; If not, obtaining the third group line including the following lines: a first line extending from one of the first light source and the second light source through one of the second intersection points to One of the second group of shadows; and a second line extending from the other of the first source and the second source through the other of the second intersections to the shadow of the second group The other. The coordinate positioning method of claim 19, wherein determining, by the third group line, that the coordinates of the at least two objects are located at two coordinates in the possible coordinates of the group includes: if the first intersection point If the position of one of the two objects is determined, determining that the other of the at least two objects is located at an intersection of at least two lines among the third group lines; and if the first intersection point is If it is determined that the position is not one of the two objects, determining that the coordinates of the at least two objects are possible combinations of two points located on the first line and the second line. The coordinate positioning method of claim 20, wherein obtaining the third group line system comprises: obtaining, by the plurality of second intersection points, a plurality of possible combinations of two points; by using the first and second light sources Connecting two of each of the possible combinations to obtain two respective lines of each of the possible combinations; for each possible combination, checking whether the two corresponding lines pass the second group shadow Two shadows in the middle; and determining that the third group line is included in the shadow through the second group The two corresponding lines of the shadow. A coordinate positioning method for a coordinate positioning device having a first light source, a second light source, at least one reflector and a detector, the method comprising: turning on the first light source and the second light source in turn to respectively Detecting a first group of shadows and a second group of shadows, the first group of shadows and the second group of shadows being projected by one or more objects entering the coordinate positioning device and appearing on the at least one reflector Obtaining a first group line according to the first group shadow; obtaining a second group line according to the second group shadow; according to the first group shadow and the second group shadow, the number of individual shadows and the The first group line and the second group line determine one or more coordinates of the one or more objects. The coordinate positioning method of claim 22, wherein determining the one or more coordinate systems of the one or more objects is further based on a common shadow number of the first group shadow and the second group shadow. The coordinate positioning method of claim 22, wherein the first group of lines includes a first line, the first light source and the first group of shadows being closest to the first one of the second light sources. Between the shadows, and the second group of lines includes a second line between the second light source and the second group shadow being closest to the second shadow of one of the first light sources. The coordinate positioning method of claim 24, wherein when the number of shadows in each of the first group shadow and the second group shadow is 2, determining one or more of the one or more objects Coordinate system includes: placing objects The coordinate is located at an intersection of one of at least two of the first group line and the second group line. The coordinate positioning method of claim 24, wherein when the number of each of the first group shadow and the second group shadow is 4, determining the one or more of the one or more objects The coordinate system includes: determining whether the first intersection point is a coordinate of one of the objects by checking whether a first intersection point is located on any one of a third line or a fourth line, wherein the first intersection point a intersection point of the first line and the second line, the third line is located between the detector and the shadow of the first group closest to a shadow of the first light source, and the fourth line Between the detector and the second group of shadows being closest to the shadow of one of the second light sources; if positive, determining that the other of the objects is located not At a second intersection of one of the plurality of lines of the first intersection point; and if negative, determining that the coordinates of the objects are respectively located at a plurality of intersections of the first group line and the second group line At two intersection points, the two intersection points are respectively located at the first intersection point Between the second shadow and located between the first intersection point and the first shadow.